Abstract: This paper focused on the analysis of the group proof protocol proposed by reference 10 and pointed out that the security defect of protocol could not resist the exhaustive attack. On this basis, an improved protocol was proposed. The protocol encrypted information by traversal inversion operation, which reversed the encryption parameters according to their Hamming weight and increased the difficulty of cracking. The protocol encrypted information before sending it, and ensured that the attacker of multiple parameters could not know the information when encrypting the information, so as to resist exhaustive attacks. Analysis of the protocol from the perspective of security shows that the protocol has good security performance; from the perspective of simulation experiments, it shows that the protocol has the advantage of low computation.